This is only on newegg, from my research, but this deal is totally insane for what you're getting consider the MSRP is 129.99 without shipping included.
GET 'EM BEFORE THE TARIFFS ROLL IN
The case looks good but at 47 liters i wouldn't consider it a mini itx case....... Its larger than many ATX cases.
Agreed. It just looks like an ATX case that has none of the support of an ATX case.
That's because it's an ethusiast designed case with space for 2 280mm rads and 4 fans on both of them. Additionally, the steel panels are more sturdy than the H series, and the airflow is really great. It has a lot more support than your normal ATX mid tower, it fits a certain group's needs.
There are plenty of cases that support more features in a similar size that also support ATX motherboards. Like this.
As I said before, this case has a specific market in mind: People who want a liquid cooled ITX build. Most likely custom loop with dual radiator. This isn't a debate about the case's size, it's just a deal. It's just a deal.
What specific market? The mini itx watercooled market? Because if so then you can get a case that is actually the size of a mini-itx case yet has water cooling support. The manta just isn't practical.
The Nano S has similar support but has a much smaller footprint. At the size of the manta it is just better to get a full ATX case, because the entire reasoning for the mini-itx form factor can't really be applied to a case that like pegotico said is bigger than a lot of ATX cases.
Also as far as the deal goes, not so much. From the look of things the pricing on PCPP has not been updated in a while or the links are old. A deal on the case? Yes. Is the case a deal? Not really.